Excerpt from The Verge
By Jacob Kastrenakes
This should go without saying, but please don't fly a drone while wearing a virtual reality headset and sitting on the edge of a cliff. I'd go further and say that you shouldn't wear a VR headset while on the edge of a cliff or even fly a drone while on the edge of a cliff period.
It's simple, people: you could fall very easily. And, at a bare minimum, it would hurt. Not recommended, both for your safety and the promising future of virtual reality and / or drones.